Shevington Vale: Petrol in a Diesel Car? How Worried to Be
Far less than you probably are, provided it hasn't been started. Everyone around Shevington Vale starts with "have I ruined it?", and the fair answer is normally no: petrol left inside the tank of a diesel remains harmless until priming, cranking or driving pulls it into the system. Leave the engine off then call Petrol in Diesel — that keeps it like that. Below, this page sets out what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Your engine and petrol in a diesel: what goes on
Passing through a motor, diesel is doing two jobs at the same time. Before it burns, it protects — and then it combusts. The high-pressure pump and the injectors are built to very fine tolerances, and your diesel passing through them is what stops those surfaces from grinding against each other.
Of those two jobs, petrol handles the first badly and the second not at all. The clattering comes from petrol being made not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the system hinges on, and any pump working on that mixture is wearing itself.
Put those together and the shape of the problem is plain. Contact does not do the damage — movement does. Where the petrol is only inside that tank, it's a problem of fuel, nothing more. Whatever a worn pump sheds goes on, borne by your fuel, into the injectors downstream, which is why a pump that has worked on that petrol is where a mechanical problem begins.
How serious is petrol in a diesel? Four situations our engineers see in Shevington Vale
Filled up, never started. The best case there is. Being at a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol held inside the tank alone, it is emptied and cleaned on the spot, and nothing more is needed.
A moment's running, or merely the ignition on. Once primed, the system has pulled petrol out of your tank up to your filter and the lines. Still usually straightforward: drain, flush, and the filter sorted.
Those few miles driven meant your pump labouring on fuel weakened by petrol the whole way. The work is your tank, the fuel lines, your filter and fresh fuel through the entire system, and how hard the car was driven counts as much as how far. Short trips, like the school run to Shevington Vale Primary School, are one thing. A run as far as Preston, under 15 miles away, is a very different job. So is any miles on the M6, under a mile from Shevington Vale, where the engine has been running hard the whole time.
Driven on until it complained — clattering, smoke, a lumpy idle, a soft throttle. The fuel isn't behaving like diesel any more, and the engine is telling you. Stop wherever you are — the verge on Miles Lane, a lay-by, a side street — and leave the car where it is. Permanent damage is very unusual when a car is stopped soon, and the drain and flush that still go first take care of it.
Shevington Vale people and that petrol in a diesel myths they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Topping up takes out nothing; it gives you a bigger tank of the same mixture. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. A modern diesel runs its fuel through more precise parts at higher pressure, which makes the lubrication matter more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that catches motorists. Feed diesel to a petrol engine and it normally will not run, so the motorist stops — and the damage stops with them. While your pump wears, a diesel fed petrol normally starts, idles and drives away as if nothing has happened. Running doesn't mean fine.
An outdated fix for a distinct problem is behind this one. Myth: "Add some two-stroke oil and drive the car home." That petrol is still inside the tank after that, and what it has weakened isn't put back.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in the filter and lines, waiting to go straight back through your pump on your next start. And, a can of petrol filled at the kerbside is truly dangerous.
Petrol in a diesel: how does it take place?
Carelessness is seldom the cause, and no one means to do it. One way only, since of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, while the diesel one generally won't fit a petrol vehicle. That's how the forecourt makes it straightforward.
Habit and your car falling out of step is when it happens. Any car that's new to you — hired, on loan as a courtesy car, or just bought. Two motors on one drive, one petrol, one diesel. Your normal forecourt, its pumps now in a different order. Racing for a train at Appley Bridge and filling up en route. The first fill-up in a diesel Renault Clio after years of driving petrol is exactly the moment it takes place. Your hand does what it has always done when you add rain, a phone call or a back seat full of children.
How to avoid petrol in a diesel on your next fill-up around Shevington Vale
- A green handle for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Go by the label on the petrol pump, not the colour.
- In a vehicle you don't know, look inside the flap over the filler or at the cap before the first fill: many motors state the fuel type there.
- One of each in the home? Label your key to your diesel — a bright fob, a sticker — because meaning to remember isn't enough.
- Before the nozzle comes off the pump the first time you fuel a hired or new car, say "diesel" out loud. Silly, yes, but it works.
- Mistakes like this are simple to make whilst your mind is on something else, and so the phone goes away.
- Some diesels have a filler built to reject a petrol nozzle, and devices you can add are available for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- Less petrol means a thinner blend, so stop the moment you realise — while remembering that your next step is unchanged. It is still not to crank it.
Put petrol in a diesel around Shevington Vale already?
Short and simple, then, is the order of things. Starting it is out, and so is switching on the ignition. Yet at the forecourt, at BP or anywhere else? Ask the staff to help you push it clear of the pump. What went in, roughly how much, and if it has run: tell us those when you phone 0333 366 0103.
Say so if it was AdBlue instead of petrol: it is a different issue, with its own page for Shevington Vale, since AdBlue brings corrosion and deposits instead of lost protection.
Why one petrol in a diesel job around Shevington Vale costs more than another
The four situations above are four separate jobs, so no single quote for this would be honest. Mostly, your cost moves with which one you are in. Two things come after that: the petrol that got in as a proportion of what the tank takes, then the place your car is in and whether a van can reach it safely.
Before any quote, not after, we ask three questions: your fuel that got in, its quantity, and if it has run. That is why. Those answers are what change a range into one firm number.
About Shevington Vale
Shevington Vale is a village in Greater Manchester, situated on the shores of a lake at an elevation of 36 metres. Shevington Vale lies near the towns of Appley Bridge and Shevington, and is close to the community of Holland Lees. Shevington Vale has a population of approximately 2353 people, predominantly living in semi-detached houses.
Fuel drain cover around Shevington Vale and across Greater Manchester
Petrol in diesel calls around Shevington Vale — part of the WN postcode area — go to vans that also cover the spots round it, Appley Bridge, Shevington and Holland Lees among them. A forecourt, a supermarket car park, a lay-by or your own drive are all places we drain, and the car doesn't need to move to us.
In Shevington Vale and still at the petrol pump?
Nothing beats it: that is where you now are. Keep it off. Ring.